128272879 has 8 divisors (see below), whose sum is σ = 149364000. Its totient is φ = 107873376.

The previous prime is 128272877. The next prime is 128272891. The reversal of 128272879 is 978272821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128272879 - 2¹ = 128272877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128272873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172504 + ... + 173245.

It is an arithmetic number, because the mean of its divisors is an integer number (18670500).

Almost surely, 2^128272879 is an apocalyptic number.

128272879 is a deficient number, since it is larger than the sum of its proper divisors (21091121).

128272879 is an equidigital number, since it uses as much as digits as its factorization.

128272879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345809.

The product of its digits is 225792, while the sum is 46.

The square root of 128272879 is about 11325.7617403864. The cubic root of 128272879 is about 504.3262970089.

The spelling of 128272879 in words is "one hundred twenty-eight million, two hundred seventy-two thousand, eight hundred seventy-nine".